It is probably a result of crossbreeding.
它可能是杂交繁殖的结果。
But traditional crossbreeding is a slow process.
但是，传统的杂交育种是一个缓慢的进程。
First successful crossbreeding of the cat and the rabbit.
第一次成功交叉喂养猫和兔子。
Therefore it is suitable to use the process of crossbreeding to increase their contents.
因此要提高它们的含量宜采用杂交育种途径。
Therefore it is suitable to use the process of crossbreeding to increase their contents.
因此要提高它们的含量宜采用杂交育种途径。
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